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NOP syntax

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Andreas Abel
2021-01-15 21:17:32 +01:00
parent d0f2ba9cc9
commit 4b54440aaf
4 changed files with 54 additions and 48 deletions
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10
README.md
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@@ -129,10 +129,10 @@ Both `nanoBench.sh` and `kernel-nanoBench.sh` support the following command-line
| Option | Description | | Option | Description |
|------------------------------|-------------| |------------------------------|-------------|
| `-asm <code>` | Assembler code sequence (in Intel syntax) containing the code to be benchmarked. | | `-asm <code>` | Assembler code sequence (in Intel syntax<sup>[1](#syntax)</sup>) containing the code to be benchmarked. |
| `-asm_init <code>` | Assembler code sequence (in Intel syntax) that is executed once in the beginning of every benchmark run. | | `-asm_init <code>` | Assembler code sequence (in Intel syntax<sup>[1](#syntax)</sup>) that is executed once in the beginning of every benchmark run. |
| `-asm_late_init <code>` | Assembler code sequence (in Intel syntax) that is executed once immediately before the code to be benchmarked. | | `-asm_late_init <code>` | Assembler code sequence (in Intel syntax<sup>[1](#syntax)</sup>) that is executed once immediately before the code to be benchmarked. |
| `-asm_one_time_init <code>` | Assembler code sequence (in Intel syntax) that is executed once before the first benchmark run. | | `-asm_one_time_init <code>` | Assembler code sequence (in Intel syntax<sup>[1](#syntax)</sup>) that is executed once before the first benchmark run. |
| `-code <filename>` | A binary file containing the code to be benchmarked as raw x86 machine code. *This option cannot be used together with `-asm`.* | | `-code <filename>` | A binary file containing the code to be benchmarked as raw x86 machine code. *This option cannot be used together with `-asm`.* |
| `-code_init <filename>` | A binary file containing code to be executed once in the beginning of every benchmark run. *This option cannot be used together with `-asm_init`.* | | `-code_init <filename>` | A binary file containing code to be executed once in the beginning of every benchmark run. *This option cannot be used together with `-asm_init`.* |
| `-code_late_init <filename>` | A binary file containing code to be executed once immediately before the code to be benchmarked. *This option cannot be used together with `-asm_late_init`.* | | `-code_late_init <filename>` | A binary file containing code to be executed once immediately before the code to be benchmarked. *This option cannot be used together with `-asm_late_init`.* |
@@ -154,6 +154,8 @@ Both `nanoBench.sh` and `kernel-nanoBench.sh` support the following command-line
| `-cpu <n>` | Pins the measurement thread to CPU n. `[Default: Pin the thread to the CPU it is currently running on.]` | | `-cpu <n>` | Pins the measurement thread to CPU n. `[Default: Pin the thread to the CPU it is currently running on.]` |
| `-verbose` | Outputs the results of all performance counter readings. In the user-space version, the results are printed to stdout. The output of the kernel module can be accessed using `dmesg`. | | `-verbose` | Outputs the results of all performance counter readings. In the user-space version, the results are printed to stdout. The output of the kernel module can be accessed using `dmesg`. |
<sup id="syntax">1</sup> As an extension, the tool also supports statements of the form `|n` (with 1&le;n&le;15) that are translated to n-byte NOPs.
The following parameters are only supported by `nanoBench.sh`. The following parameters are only supported by `nanoBench.sh`.
| Option | Description | | Option | Description |

38
kernel-nanoBench.sh
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@@ -1,5 +1,7 @@
#!/usr/bin/env bash #!/usr/bin/env bash
source utils.sh
if [ "$EUID" -ne 0 ]; then if [ "$EUID" -ne 0 ]; then
echo "Error: nanoBench requires root privileges" echo "Error: nanoBench requires root privileges"
echo "Try \"sudo ./kernel-nanoBench.sh ...\"" echo "Try \"sudo ./kernel-nanoBench.sh ...\""
@@ -18,36 +20,24 @@ taskset=""
while [ "$1" ]; do while [ "$1" ]; do
if [[ "$1" == -asm_i* ]]; then if [[ "$1" == -asm_i* ]]; then
echo ".intel_syntax noprefix" > asm-init.s assemble "$2" asm-init.bin
echo "$2" >> asm-init.s echo -n "asm-init.bin" > /sys/nb/init
as asm-init.s -o asm-init.o rm -f asm-init.bin
objcopy asm-init.o -O binary asm-init.o
echo -n "asm-init.o" > /sys/nb/init
rm -f asm-init.s asm-init.o
shift 2 shift 2
elif [[ "$1" == -asm_l* ]]; then elif [[ "$1" == -asm_l* ]]; then
echo ".intel_syntax noprefix" > asm-late-init.s assemble "$2" asm-late-init.bin
echo "$2" >> asm-late-init.s echo -n "asm-late-init.bin" > /sys/nb/late_init
as asm-late-init.s -o asm-late-init.o rm -f asm-late-init.bin
objcopy asm-late-init.o -O binary asm-late-init.o
echo -n "asm-late-init.o" > /sys/nb/late_init
rm -f asm-late-init.s asm-late-init.o
shift 2 shift 2
elif [[ "$1" == -asm_o* ]]; then elif [[ "$1" == -asm_o* ]]; then
echo ".intel_syntax noprefix" > asm-one-time-init.s assemble "$2" asm-one-time-init.bin
echo "$2" >> asm-one-time-init.s echo -n "asm-one-time-init.bin" > /sys/nb/one_time_init
as asm-one-time-init.s -o asm-one-time-init.o rm -f asm-one-time-init.bin
objcopy asm-one-time-init.o -O binary asm-one-time-init.o
echo -n "asm-one-time-init.o" > /sys/nb/one_time_init
rm -f asm-one-time-init.s asm-one-time-init.o
shift 2 shift 2
elif [[ "$1" == -as* ]]; then elif [[ "$1" == -as* ]]; then
echo ".intel_syntax noprefix" > asm-code.s assemble "$2" asm-code.bin
echo "$2" >> asm-code.s echo -n "asm-code.bin" > /sys/nb/code
as asm-code.s -o asm-code.o rm -f asm-code.bin
objcopy asm-code.o -O binary asm-code.o
echo -n "asm-code.o" > /sys/nb/code
rm -f asm-code.s asm-code.o
shift 2 shift 2
elif [[ "$1" == -code_i* ]]; then elif [[ "$1" == -code_i* ]]; then
echo -n "$2" > /sys/nb/init echo -n "$2" > /sys/nb/init

27
nanoBench.sh
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@@ -1,5 +1,7 @@
#!/usr/bin/env bash #!/usr/bin/env bash
source utils.sh
if [ "$EUID" -ne 0 ]; then if [ "$EUID" -ne 0 ]; then
echo "Error: nanoBench requires root privileges" 1>&2 echo "Error: nanoBench requires root privileges" 1>&2
echo "Try \"sudo ./nanoBench-asm.sh ...\"" 1>&2 echo "Try \"sudo ./nanoBench-asm.sh ...\"" 1>&2
@@ -22,31 +24,19 @@ done
args='' args=''
while [ "$2" ]; do while [ "$2" ]; do
if [[ "$1" == -asm_i* ]]; then if [[ "$1" == -asm_i* ]]; then
echo ".intel_syntax noprefix" > asm-init.s assemble "$2" asm-init.bin
echo "$2" >> asm-init.s
as asm-init.s -o asm-init.o || exit
objcopy asm-init.o -O binary asm-init.bin
args="$args -code_init asm-init.bin" args="$args -code_init asm-init.bin"
shift 2 shift 2
elif [[ "$1" == -asm_l* ]]; then elif [[ "$1" == -asm_l* ]]; then
echo ".intel_syntax noprefix" > asm-late-init.s assemble "$2" asm-late-init.bin
echo "$2" >> asm-late-init.s
as asm-late-init.s -o asm-late-init.o || exit
objcopy asm-late-init.o -O binary asm-late-init.bin
args="$args -code_late_init asm-late-init.bin" args="$args -code_late_init asm-late-init.bin"
shift 2 shift 2
elif [[ "$1" == -asm_o* ]]; then elif [[ "$1" == -asm_o* ]]; then
echo ".intel_syntax noprefix" > asm-one-time-init.s assemble "$2" asm-one-time-init.bin
echo "$2" >> asm-one-time-init.s
as asm-one-time-init.s -o asm-one-time-init.o || exit
objcopy asm-one-time-init.o -O binary asm-one-time-init.bin
args="$args -code_one_time_init asm-one-time-init.bin" args="$args -code_one_time_init asm-one-time-init.bin"
shift 2 shift 2
elif [[ "$1" == -as* ]]; then elif [[ "$1" == -as* ]]; then
echo ".intel_syntax noprefix" > asm-code.s assemble "$2" asm-code.bin
echo "$2" >> asm-code.s
as asm-code.s -o asm-code.o || exit
objcopy asm-code.o -O binary asm-code.bin
args="$args -code asm-code.bin" args="$args -code asm-code.bin"
shift 2 shift 2
else else
@@ -79,10 +69,7 @@ else
user/nanoBench $@ user/nanoBench $@
fi fi
rm -f asm-code.* rm -f asm-*.bin
rm -f asm-init.*
rm -f asm-late-init.*
rm -f asm-one-time-init.*
echo $prev_rdpmc > /sys/bus/event_source/devices/cpu/rdpmc echo $prev_rdpmc > /sys/bus/event_source/devices/cpu/rdpmc
echo $prev_nmi_watchdog > /proc/sys/kernel/nmi_watchdog echo $prev_nmi_watchdog > /proc/sys/kernel/nmi_watchdog

27
utils.sh Normal file
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@@ -0,0 +1,27 @@
assemble() {
asm=$1
filename=$2
echo ".intel_syntax noprefix" > asm-tmp.s
echo "$asm" >> asm-tmp.s
sed -i "
s/|15/.byte 0x66,0x66,0x66,0x66,0x66,0x66,0x2e,0x0f,0x1f,0x84,0x00,0x00,0x00,0x00,0x00;/g
s/|14/.byte 0x66,0x66,0x66,0x66,0x66,0x2e,0x0f,0x1f,0x84,0x00,0x00,0x00,0x00,0x00;/g
s/|13/.byte 0x66,0x66,0x66,0x66,0x2e,0x0f,0x1f,0x84,0x00,0x00,0x00,0x00,0x00;/g
s/|12/.byte 0x66,0x66,0x66,0x2e,0x0f,0x1f,0x84,0x00,0x00,0x00,0x00,0x00;/g
s/|11/.byte 0x66,0x66,0x2e,0x0f,0x1f,0x84,0x00,0x00,0x00,0x00,0x00;/g
s/|10/.byte 0x66,0x2e,0x0f,0x1f,0x84,0x00,0x00,0x00,0x00,0x00;/g
s/|9/.byte 0x66,0x0f,0x1f,0x84,0x00,0x00,0x00,0x00,0x00;/g
s/|8/.byte 0x0f,0x1f,0x84,0x00,0x00,0x00,0x00,0x00;/g
s/|7/.byte 0x0f,0x1f,0x80,0x00,0x00,0x00,0x00;/g
s/|6/.byte 0x66,0x0f,0x1f,0x44,0x00,0x00;/g
s/|5/.byte 0x0f,0x1f,0x44,0x00,0x00;/g
s/|4/.byte 0x0f,0x1f,0x40,0x00;/g
s/|3/.byte 0x0f,0x1f,0x00;/g
s/|2/.byte 0x66,0x90;/g
s/|1/nop;/g
s/|//g
" asm-tmp.s
as asm-tmp.s -o asm-tmp.o || exit
objcopy asm-tmp.o -O binary "$filename"
rm asm-tmp.*
}